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Symbolic seems to have an error
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Two typos in my original post corrected
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John D'Errico
el 11 de Sept. de 2020
Editada: John D'Errico
el 11 de Sept. de 2020
Then why did you feel the need to post it again? Just edit your original post. Anyway, it seems like everytime you don't understand a piece of code, you declare it to be a bug.
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Paul
el 11 de Sept. de 2020
Editada: Paul
el 12 de Sept. de 2020
The RHS of your differential equation should be 3*u.
In the frequency domain, Y(s) = H(s)*U(s). It looks like you're trying to get the step repsonse of your second order system, so U(s) = 1/s. You forgot to multiply by U(s) in your symbolic approach.
num = 3;
den = [1 2 5];
syms s
nums = poly2sym(num,s);
dens = poly2sym(conv(den,[1 0]),s); % here!
ilaplace(nums/dens)
ans =
3/5 - (3*exp(-t)*(cos(2*t) + sin(2*t)/2))/5
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